[DirectWrite] Disable subpixel font positioning for old fonts

Source/platform/fonts/win/FontPlatformDataWin.cpp

Index: Source/platform/fonts/win/FontPlatformDataWin.cpp
diff --git a/Source/platform/fonts/win/FontPlatformDataWin.cpp b/Source/platform/fonts/win/FontPlatformDataWin.cpp
index b0037c44e7d700e744a040cdad3ca276a71adbfb..398088717b3f0b834be87889025c04bfca422e70 100644
--- a/Source/platform/fonts/win/FontPlatformDataWin.cpp
+++ b/Source/platform/fonts/win/FontPlatformDataWin.cpp
@@ -69,7 +69,7 @@ void FontPlatformData::setupPaint(SkPaint* paint, GraphicsContext* context) cons
         // run without font smoothing we enable it for tests to ensure we get
         // good test coverage matching the more common smoothing enabled
         // behavior.
-        if (m_useSubpixelPositioning
+        if (m_useSubpixelPositioning && ts >= m_minSizeForSubpixel
             && ((textFlags & SkPaint::kAntiAlias_Flag) || LayoutTestSupport::isRunningLayoutTest()))
             flags |= SkPaint::kSubpixelText_Flag;